_______ of water makes Death Valley a desert, but it is by no means devoid.

A．Lacking

B．Being lack

C．Because of lack

D．Lack

碳化硅阀式避雷器外绝缘的检修中，瓷外套与法兰处粘合应牢固、无破损，粘合处露沙高度不小于（），并均匀涂覆防水密封胶。

A.40mm

B.30mm

C.10mm

D.20mm